u-boot/drivers/usb/eth/lan78xx.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2017 Microchip Technology Inc. All rights reserved.
*/
#include <dm.h>
#include <usb.h>
#include "usb_ether.h"
#include "lan7x.h"
/* LAN78xx specific register/bit defines */
#define LAN78XX_HW_CFG_LED1_EN BIT(21) /* Muxed with EEDO */
#define LAN78XX_HW_CFG_LED0_EN BIT(20) /* Muxed with EECLK */
#define LAN78XX_USB_CFG0 0x080
#define LAN78XX_USB_CFG0_BIR BIT(6)
#define LAN78XX_BURST_CAP 0x090
#define LAN78XX_BULK_IN_DLY 0x094
#define LAN78XX_RFE_CTL 0x0B0
#define LAN78XX_FCT_RX_CTL 0x0C0
#define LAN78XX_FCT_TX_CTL 0x0C4
#define LAN78XX_FCT_RX_FIFO_END 0x0C8
#define LAN78XX_FCT_TX_FIFO_END 0x0CC
#define LAN78XX_FCT_FLOW 0x0D0
#define LAN78XX_MAF_BASE 0x400
#define LAN78XX_MAF_HIX 0x00
#define LAN78XX_MAF_LOX 0x04
#define LAN78XX_MAF_HI_BEGIN (LAN78XX_MAF_BASE + LAN78XX_MAF_HIX)
#define LAN78XX_MAF_LO_BEGIN (LAN78XX_MAF_BASE + LAN78XX_MAF_LOX)
#define LAN78XX_MAF_HI(index) (LAN78XX_MAF_BASE + (8 * (index)) + \
LAN78XX_MAF_HIX)
#define LAN78XX_MAF_LO(index) (LAN78XX_MAF_BASE + (8 * (index)) + \
LAN78XX_MAF_LOX)
#define LAN78XX_MAF_HI_VALID BIT(31)
/* OTP registers */
#define LAN78XX_OTP_BASE_ADDR 0x00001000
#define LAN78XX_OTP_PWR_DN (LAN78XX_OTP_BASE_ADDR + 4 * 0x00)
#define LAN78XX_OTP_PWR_DN_PWRDN_N BIT(0)
#define LAN78XX_OTP_ADDR1 (LAN78XX_OTP_BASE_ADDR + 4 * 0x01)
#define LAN78XX_OTP_ADDR1_15_11 0x1F
#define LAN78XX_OTP_ADDR2 (LAN78XX_OTP_BASE_ADDR + 4 * 0x02)
#define LAN78XX_OTP_ADDR2_10_3 0xFF
#define LAN78XX_OTP_RD_DATA (LAN78XX_OTP_BASE_ADDR + 4 * 0x06)
#define LAN78XX_OTP_FUNC_CMD (LAN78XX_OTP_BASE_ADDR + 4 * 0x08)
#define LAN78XX_OTP_FUNC_CMD_READ BIT(0)
#define LAN78XX_OTP_CMD_GO (LAN78XX_OTP_BASE_ADDR + 4 * 0x0A)
#define LAN78XX_OTP_CMD_GO_GO BIT(0)
#define LAN78XX_OTP_STATUS (LAN78XX_OTP_BASE_ADDR + 4 * 0x0C)
#define LAN78XX_OTP_STATUS_BUSY BIT(0)
#define LAN78XX_OTP_INDICATOR_1 0xF3
#define LAN78XX_OTP_INDICATOR_2 0xF7
/*
* Lan78xx infrastructure commands
*/
static int lan78xx_read_raw_otp(struct usb_device *udev, u32 offset,
u32 length, u8 *data)
{
int i;
int ret;
u32 buf;
ret = lan7x_read_reg(udev, LAN78XX_OTP_PWR_DN, &buf);
if (ret)
return ret;
if (buf & LAN78XX_OTP_PWR_DN_PWRDN_N) {
/* clear it and wait to be cleared */
ret = lan7x_write_reg(udev, LAN78XX_OTP_PWR_DN, 0);
if (ret)
return ret;
ret = lan7x_wait_for_bit(udev, "LAN78XX_OTP_PWR_DN_PWRDN_N",
LAN78XX_OTP_PWR_DN,
LAN78XX_OTP_PWR_DN_PWRDN_N,
false, 1000, 0);
if (ret)
return ret;
}
for (i = 0; i < length; i++) {
ret = lan7x_write_reg(udev, LAN78XX_OTP_ADDR1,
((offset + i) >> 8) &
LAN78XX_OTP_ADDR1_15_11);
if (ret)
return ret;
ret = lan7x_write_reg(udev, LAN78XX_OTP_ADDR2,
((offset + i) & LAN78XX_OTP_ADDR2_10_3));
if (ret)
return ret;
ret = lan7x_write_reg(udev, LAN78XX_OTP_FUNC_CMD,
LAN78XX_OTP_FUNC_CMD_READ);
if (ret)
return ret;
ret = lan7x_write_reg(udev, LAN78XX_OTP_CMD_GO,
LAN78XX_OTP_CMD_GO_GO);
if (ret)
return ret;
ret = lan7x_wait_for_bit(udev, "LAN78XX_OTP_STATUS_BUSY",
LAN78XX_OTP_STATUS,
LAN78XX_OTP_STATUS_BUSY,
false, 1000, 0);
if (ret)
return ret;
ret = lan7x_read_reg(udev, LAN78XX_OTP_RD_DATA, &buf);
if (ret)
return ret;
data[i] = (u8)(buf & 0xFF);
}
return 0;
}
static int lan78xx_read_otp(struct usb_device *udev, u32 offset,
u32 length, u8 *data)
{
u8 sig;
int ret;
ret = lan78xx_read_raw_otp(udev, 0, 1, &sig);
if (!ret) {
if (sig == LAN78XX_OTP_INDICATOR_1)
offset = offset;
else if (sig == LAN78XX_OTP_INDICATOR_2)
offset += 0x100;
else
return -EINVAL;
ret = lan78xx_read_raw_otp(udev, offset, length, data);
if (ret)
return ret;
}
debug("LAN78x: MAC address from OTP = %pM\n", data);
return ret;
}
static int lan78xx_read_otp_mac(unsigned char *enetaddr,
struct usb_device *udev)
{
int ret;
memset(enetaddr, 0, 6);
ret = lan78xx_read_otp(udev,
EEPROM_MAC_OFFSET,
ETH_ALEN,
enetaddr);
if (!ret && is_valid_ethaddr(enetaddr)) {
/* eeprom values are valid so use them */
debug("MAC address read from OTP %pM\n", enetaddr);
return 0;
}
debug("MAC address read from OTP invalid %pM\n", enetaddr);
memset(enetaddr, 0, 6);
return -EINVAL;
}
static int lan78xx_update_flowcontrol(struct usb_device *udev,
struct ueth_data *dev)
{
uint32_t flow = 0, fct_flow = 0;
int ret;
ret = lan7x_update_flowcontrol(udev, dev, &flow, &fct_flow);
if (ret)
return ret;
ret = lan7x_write_reg(udev, LAN78XX_FCT_FLOW, fct_flow);
if (ret)
return ret;
return lan7x_write_reg(udev, FLOW, flow);
}
static int lan78xx_read_mac(unsigned char *enetaddr,
struct usb_device *udev,
struct lan7x_private *priv)
{
u32 val;
int ret;
int saved = 0, done = 0;
/*
* Depends on chip, some EEPROM pins are muxed with LED function.
* disable & restore LED function to access EEPROM.
*/
if ((priv->chipid == ID_REV_CHIP_ID_7800) ||
(priv->chipid == ID_REV_CHIP_ID_7850)) {
ret = lan7x_read_reg(udev, HW_CFG, &val);
if (ret)
return ret;
saved = val;
val &= ~(LAN78XX_HW_CFG_LED1_EN | LAN78XX_HW_CFG_LED0_EN);
ret = lan7x_write_reg(udev, HW_CFG, val);
if (ret)
goto restore;
}
/*
* Refer to the doc/README.enetaddr and doc/README.usb for
* the U-Boot MAC address policy
*/
/* try reading mac address from EEPROM, then from OTP */
ret = lan7x_read_eeprom_mac(enetaddr, udev);
if (!ret)
done = 1;
restore:
if ((priv->chipid == ID_REV_CHIP_ID_7800) ||
(priv->chipid == ID_REV_CHIP_ID_7850)) {
ret = lan7x_write_reg(udev, HW_CFG, saved);
if (ret)
return ret;
}
/* if the EEPROM mac address is good, then exit */
if (done)
return 0;
/* try reading mac address from OTP if the device is LAN78xx */
return lan78xx_read_otp_mac(enetaddr, udev);
}
static int lan78xx_set_receive_filter(struct usb_device *udev)
{
/* No multicast in u-boot for now */
return lan7x_write_reg(udev, LAN78XX_RFE_CTL,
RFE_CTL_BCAST_EN | RFE_CTL_DA_PERFECT);
}
/* starts the TX path */
static void lan78xx_start_tx_path(struct usb_device *udev)
{
/* Enable Tx at MAC */
lan7x_write_reg(udev, MAC_TX, MAC_TX_TXEN);
/* Enable Tx at SCSRs */
lan7x_write_reg(udev, LAN78XX_FCT_TX_CTL, FCT_TX_CTL_EN);
}
/* Starts the Receive path */
static void lan78xx_start_rx_path(struct usb_device *udev)
{
/* Enable Rx at MAC */
lan7x_write_reg(udev, MAC_RX,
LAN7X_MAC_RX_MAX_SIZE_DEFAULT |
MAC_RX_FCS_STRIP | MAC_RX_RXEN);
/* Enable Rx at SCSRs */
lan7x_write_reg(udev, LAN78XX_FCT_RX_CTL, FCT_RX_CTL_EN);
}
static int lan78xx_basic_reset(struct usb_device *udev,
struct ueth_data *dev,
struct lan7x_private *priv)
{
int ret;
u32 val;
ret = lan7x_basic_reset(udev, dev);
if (ret)
return ret;
/* Keep the chip ID */
ret = lan7x_read_reg(udev, ID_REV, &val);
if (ret)
return ret;
debug("LAN78xx ID_REV = 0x%08x\n", val);
priv->chipid = (val & ID_REV_CHIP_ID_MASK) >> 16;
/* Respond to the IN token with a NAK */
ret = lan7x_read_reg(udev, LAN78XX_USB_CFG0, &val);
if (ret)
return ret;
val |= LAN78XX_USB_CFG0_BIR;
return lan7x_write_reg(udev, LAN78XX_USB_CFG0, val);
}
int lan78xx_write_hwaddr(struct udevice *dev)
{
struct usb_device *udev = dev_get_parent_priv(dev);
struct eth_pdata *pdata = dev_get_platdata(dev);
unsigned char *enetaddr = pdata->enetaddr;
u32 addr_lo = get_unaligned_le32(&enetaddr[0]);
u32 addr_hi = (u32)get_unaligned_le16(&enetaddr[4]);
int ret;
/* set hardware address */
ret = lan7x_write_reg(udev, RX_ADDRL, addr_lo);
if (ret)
return ret;
ret = lan7x_write_reg(udev, RX_ADDRH, addr_hi);
if (ret)
return ret;
ret = lan7x_write_reg(udev, LAN78XX_MAF_LO(0), addr_lo);
if (ret)
return ret;
ret = lan7x_write_reg(udev, LAN78XX_MAF_HI(0),
addr_hi | LAN78XX_MAF_HI_VALID);
if (ret)
return ret;
debug("MAC addr %pM written\n", enetaddr);
return 0;
}
static int lan78xx_eth_start(struct udevice *dev)
{
struct usb_device *udev = dev_get_parent_priv(dev);
struct lan7x_private *priv = dev_get_priv(dev);
int ret;
u32 write_buf;
/* Reset and read Mac addr were done in probe() */
ret = lan78xx_write_hwaddr(dev);
if (ret)
return ret;
ret = lan7x_write_reg(udev, LAN78XX_BURST_CAP, 0);
if (ret)
return ret;
ret = lan7x_write_reg(udev, LAN78XX_BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
if (ret)
return ret;
ret = lan7x_write_reg(udev, INT_STS, 0xFFFFFFFF);
if (ret)
return ret;
/* set FIFO sizes */
ret = lan7x_write_reg(udev, LAN78XX_FCT_RX_FIFO_END,
(MAX_RX_FIFO_SIZE - 512) / 512);
if (ret)
return ret;
ret = lan7x_write_reg(udev, LAN78XX_FCT_TX_FIFO_END,
(MAX_TX_FIFO_SIZE - 512) / 512);
if (ret)
return ret;
/* Init Tx */
ret = lan7x_write_reg(udev, FLOW, 0);
if (ret)
return ret;
/* Init Rx. Set Vlan, keep default for VLAN on 78xx */
ret = lan78xx_set_receive_filter(udev);
if (ret)
return ret;
/* Init PHY, autonego, and link */
ret = lan7x_eth_phylib_connect(dev, &priv->ueth);
if (ret)
return ret;
ret = lan7x_eth_phylib_config_start(dev);
if (ret)
return ret;
/*
* MAC_CR has to be set after PHY init.
* MAC will auto detect the PHY speed.
*/
ret = lan7x_read_reg(udev, MAC_CR, &write_buf);
if (ret)
return ret;
write_buf |= MAC_CR_AUTO_DUPLEX | MAC_CR_AUTO_SPEED | MAC_CR_ADP;
ret = lan7x_write_reg(udev, MAC_CR, write_buf);
if (ret)
return ret;
lan78xx_start_tx_path(udev);
lan78xx_start_rx_path(udev);
return lan78xx_update_flowcontrol(udev, &priv->ueth);
}
int lan78xx_read_rom_hwaddr(struct udevice *dev)
{
struct usb_device *udev = dev_get_parent_priv(dev);
struct eth_pdata *pdata = dev_get_platdata(dev);
struct lan7x_private *priv = dev_get_priv(dev);
int ret;
ret = lan78xx_read_mac(pdata->enetaddr, udev, priv);
if (ret)
memset(pdata->enetaddr, 0, 6);
return 0;
}
static int lan78xx_eth_probe(struct udevice *dev)
{
struct usb_device *udev = dev_get_parent_priv(dev);
struct lan7x_private *priv = dev_get_priv(dev);
struct ueth_data *ueth = &priv->ueth;
struct eth_pdata *pdata = dev_get_platdata(dev);
int ret;
/* Do a reset in order to get the MAC address from HW */
if (lan78xx_basic_reset(udev, ueth, priv))
return 0;
/* Get the MAC address */
/*
* We must set the eth->enetaddr from HW because the upper layer
* will force to use the environmental var (usbethaddr) or random if
* there is no valid MAC address in eth->enetaddr.
*/
lan78xx_read_mac(pdata->enetaddr, udev, priv);
/* Do not return 0 for not finding MAC addr in HW */
ret = usb_ether_register(dev, ueth, RX_URB_SIZE);
if (ret)
return ret;
/* Register phylib */
return lan7x_phylib_register(dev);
}
static const struct eth_ops lan78xx_eth_ops = {
.start = lan78xx_eth_start,
.send = lan7x_eth_send,
.recv = lan7x_eth_recv,
.free_pkt = lan7x_free_pkt,
.stop = lan7x_eth_stop,
.write_hwaddr = lan78xx_write_hwaddr,
.read_rom_hwaddr = lan78xx_read_rom_hwaddr,
};
U_BOOT_DRIVER(lan78xx_eth) = {
.name = "lan78xx_eth",
.id = UCLASS_ETH,
.probe = lan78xx_eth_probe,
.remove = lan7x_eth_remove,
.ops = &lan78xx_eth_ops,
.priv_auto_alloc_size = sizeof(struct lan7x_private),
.platdata_auto_alloc_size = sizeof(struct eth_pdata),
};
static const struct usb_device_id lan78xx_eth_id_table[] = {
{ USB_DEVICE(0x0424, 0x7800) }, /* LAN7800 USB Ethernet */
{ USB_DEVICE(0x0424, 0x7850) }, /* LAN7850 USB Ethernet */
{ } /* Terminating entry */
};
U_BOOT_USB_DEVICE(lan78xx_eth, lan78xx_eth_id_table);